Which statement is true regarding the transfer of SQL knowledge to PROC SQL?

The statement that highlights differences in implementations of SQL across databases is true. While many SQL concepts are consistent due to ANSI SQL standards, implementations can vary significantly among different database systems, including how SQL is executed and the features available.

In the context of PROC SQL, while it follows many ANSI SQL principles, it also incorporates unique features and syntax that are specific to SAS. Therefore, even if one is proficient in SQL, they may encounter significant differences when working within PROC SQL in SAS. This can include variations in function availability, data types, and how certain interactions with tables are handled.

Being aware of these distinctions is important for effective programming, as it allows for the successful adaptation of SQL queries and practices to the SAS environment while minimizing misunderstandings that could lead to errors in code or logic. This understanding aids in leveraging the full capabilities of PROC SQL while recognizing where adaptations may be necessary.